
package top.maxim.im.common.utils;

import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.StatFs;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.text.TextUtils;

import java.io.File;

/**
 * Description : 文件操作管理类 Created by Mango on 2018/11/06.
 */
public class FileUtils {

    private FileUtils() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    /**
     * 通过路径创建文件
     * 
     * @param path 路径
     * @return File
     */
    public static File getFileByPath(String path) {
        if (TextUtils.isEmpty(path)) {
            return null;
        }
        File file = new File(path);
        if (!file.exists()) {
            file.mkdir();
        }
        return file;
    }

    /**
     * @return 检查sdcard 空间大于500kb true
     */
    public static Boolean checkSDCard() {
        if (!isSDExist()) {
            return false;
        }
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            if (moreSDAvailableSpare()) {
                return true;
            }
        } else {
            return false;
        }
        return false;
    }

    /**
     * 判断SD卡是否存在
     *
     * @return boolean
     */
    public static boolean isSDExist() {
        return Environment.getExternalStorageDirectory().exists();
    }

    /**
     * @return sdcard 空间
     */
    public static boolean moreSDAvailableSpare() {
        File path = Environment.getExternalStorageDirectory();
        StatFs statfs = new StatFs(path.getPath());
        long blocSize = statfs.getBlockSize(); // byte
        long totalBlocks = statfs.getBlockCount();
        long availaBlock = statfs.getAvailableBlocks();
        long total = totalBlocks * blocSize;
        long availale = availaBlock * blocSize;
        int arrMemorySD = (int)((total - availale) / 1024); // kb
        return arrMemorySD > 500; // 500 kb
    }

    public static String getFilePathByUri(Uri uri) {
        if (uri == null) {
            return "";
        }
        String path;
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {// 4.4以后
            path = getPath(AppContextUtils.getAppContext(), uri);
        } else {// 4.4以下下系统调用方法
            path = getRealPathFromURI(uri);
        }
        return path;
    }

    private static String getRealPathFromURI(Uri contentUri) {
        String res = null;
        String[] proj = {
                MediaStore.Images.Media.DATA
        };
        Cursor cursor = AppContextUtils.getAppContext().getContentResolver().query(contentUri, proj,
                null, null, null);
        if (null != cursor && cursor.moveToFirst()) {
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            res = cursor.getString(column_index);
            cursor.close();
        }
        return res;
    }

    /**
     * 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使
     */
    @SuppressLint("NewApi")
    private static String getPath(final Context context, final Uri uri) {

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[] {
                        split[1]
                };

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }
        return null;
    }

    /**
     * Get the value of the data column for this Uri. This is useful for MediaStore
     * Uris, and other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri The Uri to query.
     * @param selection (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    private static String getDataColumn(Context context, Uri uri, String selection,
            String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {
                column
        };

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    private static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
}
